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      <a id="cosseg"></a>
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      <a id="IndexCosseg" class="indexterm"></a>
      <div class="refnamediv">
        <h2>
          <span class="refentrytitle">cosseg</span>
        </h2>
        <p>cosseg — 
      Trace a series of line segments between specified points with
      cosine interpolation.
    </p>
      </div>
      <div class="refsect1">
        <a id="idp95698368"></a>
        <h2>Description</h2>
        <p>
      Trace a series of line segments between specified points with
      cosine interpolation.
    </p>
      </div>
      <div class="refsect1">
        <a id="idp95699632"></a>
        <h2>Syntax</h2>
        <pre class="synopsis">ares <span class="command"><strong>cosseg</strong></span> ia, idur1, ib [, idur2] [, ic] [...]</pre>
        <pre class="synopsis">kres <span class="command"><strong>cosseg</strong></span> ia, idur1, ib [, idur2] [, ic] [...]</pre>
      </div>
      <div class="refsect1">
        <a id="idp95762144"></a>
        <h2>Initialization</h2>
        <p>
      <span class="emphasis"><em>ia</em></span> -- starting value.
    </p>
        <p>
      <span class="emphasis"><em>ib, ic</em></span>, etc. -- value after
      <span class="emphasis"><em>dur1</em></span> seconds, etc. 
    </p>
        <p>
      <span class="emphasis"><em>idur1</em></span> -- duration in seconds of first
      segment. A zero or negative value will cause all initialization
      to be skipped. 
    </p>
        <p>
      <span class="emphasis"><em>idur2, idur3</em></span>, etc. -- duration in seconds
      of subsequent segments. A zero or negative value will terminate
      the initialization process with the preceding point, permitting
      the last-defined line or curve to be continued indefinitely in
      performance. The default is zero. 
    </p>
      </div>
      <div class="refsect1">
        <a id="idp95766816"></a>
        <h2>Performance</h2>
        <p>
      These units generate control or audio signals whose values can
      pass through 2 or more specified points. The sum of
      <span class="emphasis"><em>dur</em></span> values may or may not equal the
      instrument's performance time: a shorter performance will
      truncate the specified pattern, while a longer one will cause
      the last value to be repeated until the end of the note. 
    </p>
      </div>
      <div class="refsect1">
        <a id="idp95768752"></a>
        <h2>Examples</h2>
        <p>
      Here is an example of the cosseg opcode. It uses the file <a class="ulink" href="examples/cosseg.csd" target="_top"><em class="citetitle">cosseg.csd</em></a>.

      </p>
        <div class="example">
          <a id="idp95770400"></a>
          <p class="title">
            <strong>Example 138. Example of the cosseg opcode.</strong>
          </p>
          <div class="example-contents">
            <p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
            <pre class="programlisting">
<span class="csdtag">&lt;CsoundSynthesizer&gt;</span>
<span class="csdtag">&lt;CsOptions&gt;</span>
<span class="comment">; Select audio/midi flags here according to platform</span>
-odac      <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc    ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">;-o linseg.wav -W ;;; for file output any platform</span>
<span class="csdtag">&lt;/CsOptions&gt;</span>
<span class="csdtag">&lt;CsInstruments&gt;</span>

<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span>  <span class="op">=</span> 1

giSine <span class="ohdr">ftgen</span> 0, 0, 2^10, 10, 1

<span class="oblock">instr</span> 1

kcps <span class="op">=</span> <span class="opc">cpspch</span>(p4)
kenv <span class="opc">cosseg</span> 0, 0.25, 1, 0.75, 0	<span class="comment">; together = 1 sec</span>
asig <span class="opc">poscil</span> kenv, kcps, giSine
     <span class="opc">outs</span> asig, asig

<span class="oblock">endin</span>

<span class="oblock">instr</span> 2	<span class="comment">; scaling to duration</span>

kcps <span class="op">=</span> <span class="opc">cpspch</span>(p4)
kenv <span class="opc">cosseg</span> 0, p3<span class="op">*</span>0.25, 1, p3<span class="op">*</span>0.75, 0
asig <span class="opc">poscil</span> kenv, kcps, giSine
     <span class="opc">outs</span> asig, asig

<span class="oblock">endin</span>

<span class="oblock">instr</span> 3	<span class="comment">; with negative value</span>

kcps <span class="op">=</span> <span class="opc">cpspch</span>(p4)
aenv <span class="opc">cosseg</span> 0, 0.1, 1, 0.5, <span class="op">-</span>0.9, 0.4, 0
asig <span class="opc">poscil</span> aenv, kcps, giSine
     <span class="opc">outs</span> asig, asig

<span class="oblock">endin</span>
<span class="csdtag">&lt;/CsInstruments&gt;</span>
<span class="csdtag">&lt;CsScore&gt;</span>

<span class="stamnt">i</span> 1 0 1   7.00	<span class="comment">; = 1 sec, p3 fits exactly</span>
<span class="stamnt">i</span> 1 2 2   7.00	<span class="comment">; = 2 sec, p3 truncated at 1 sec</span>

<span class="stamnt">i</span> 2 4 1   7.00	<span class="comment">; scales to duration</span>
<span class="stamnt">i</span> 2 6 2   7.00	<span class="comment">; of p3</span>

<span class="stamnt">i</span> 3 9 2   7.00
<span class="stamnt">e</span>
<span class="csdtag">&lt;/CsScore&gt;</span>
<span class="csdtag">&lt;/CsoundSynthesizer&gt;</span>
</pre>
          </div>
        </div>
        <p><br class="example-break" />
    </p>
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      <div class="refsect1">
        <a id="idp95773808"></a>
        <h2>See Also</h2>
        <p>
      <a class="link" href="expon.html" title="expon"><em class="citetitle">expon</em></a>,
      <a class="link" href="expseg.html" title="expseg"><em class="citetitle">expseg</em></a>,
      <a class="link" href="expsegb.html" title="expsegb"><em class="citetitle">expsegb</em></a>,
      <a class="link" href="expsegr.html" title="expsegr"><em class="citetitle">expsegr</em></a>,
      <a class="link" href="line.html" title="line"><em class="citetitle">line</em></a>,
      <a class="link" href="linseg.html" title="linseg"><em class="citetitle">linseg</em></a>,
      <a class="link" href="linsegr.html" title="linsegr"><em class="citetitle">linsegr</em></a>
      <a class="link" href="transeg.html" title="transeg"><em class="citetitle">transeg</em></a>
      <a class="link" href="transegb.html" title="transegb"><em class="citetitle">transegb</em></a>
    </p>
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      <div class="refsect1">
        <a id="idp95781728"></a>
        <h2>Credits</h2>
        <p>
       </p>
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          <tr>
            <td>Author: John ffitch</td>
          </tr>
          <tr>
            <td>Aug 2012 </td>
          </tr>
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        <p>
    </p>
        <p> New in version 5.18</p>
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